How do I help my girlfriend.......?

How do I help my girlfriend/Lover feel good about herself??? She is very Insecure...She is taller than me 5 more inches, I'm 5'1, and she is very Gorgeous to me......I'm thick, and so is she......But her height makes it look better......She wants a very discreet relationship, becuz of her professional job, So she does not want to be seen in certain places, which I get upset, but oh well.......What do I do????